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[1]李想　王军　宋彩玉　梅苑　帅健　张光学　李云涛.障碍物条件下氢气火焰传播特性的大涡模拟计算[J].油气储运,2024,43(02):1-13.
　LI Xiang,LI Yukun,LIN Haoran,et al.Study on the Propagation Characteristics of Hydrogen Flame in Obstacle Conditions[J].Oil & Gas Storage and Transportation,2024,43(02):1-13.

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障碍物条件下氢气火焰传播特性的大涡模拟计算

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年02期页码: 1-13 栏目: 出版日期: 2024-02-25

Title:: Study on the Propagation Characteristics of Hydrogen Flame in Obstacle Conditions

作者:: 李想　王军　宋彩玉　梅苑　帅健　张光学　李云涛

Author(s):: LI Xiang; LI Yukun; LIN Haoran; TAI Jun; BAI Hua; GUAN Zhiwei

关键词:: 氢气; 燃烧; 障碍物; 火焰传播; 流场变化; 流速变化

Keywords:: Hydrogen combustion; Obstacles; Flame propagation; Flow field changes; Accelerate

分类号:: X93；TE88

文献标志码:: A

摘要:: 【目的】与常规气体燃料相比，氢气的爆炸危险性更大，障碍物的存在又会极大激励氢气燃烧，加快火焰传播速度，造成更为严重的事故后果。为减少氢气在障碍物条件下带来的破坏性伤害，揭示不同障碍物条件对于氢气火焰传播特性的影响尤为重要。【方法】基于大涡模拟对不同障碍物形状及障碍物阻塞率条件下的氢气/空气燃爆过程进行了数值模拟，重点研究了障碍物形状对火焰传播速度影响的差异性、对阻塞率变化的敏感性。【结果】当阻塞率较低时，与单边型障碍物相比，格栅型障碍物对火焰锋面处的规则流场具有更强的破坏作用，随着格栅型障碍物空隙数量的增多，其对流场运动的破坏性进一步提升，使得火焰锋面难以恢复至规则状态；阻塞率提高后，不同形状的障碍物对规则流场的破坏差异性变得不再明显，所有障碍物工况中火焰锋面都发生了持续性畸变；随着阻塞率持续提升，与格栅型障碍物相比，单边型障碍物将带来更高的火焰传播速度峰值；在相同阻塞率条件下，格栅型障碍物可通过调整单个空隙面积，转变其对火焰加速的机理，从而增强加速效果。【结论】障碍物的形状、阻塞率是影响障碍物后方火焰锋面状态的关键因素，单边型障碍物对阻塞率的敏感性更强，而格栅型障碍物的加速潜力更高，阻塞率的增大会放大障碍物形状引起的加速差异性。研究结果可为氢气火灾事故防治提供基础的参考数据，并在氢能动力系统设计层面提供借鉴。

Abstract:: Compared to conventional gas fuels, hydrogen has a stronger explosion hazard. Especially under obstacle conditions, it can greatly stimulate gas combustion, accelerate flame propagation, and cause more serious accident consequences. In order to reveal the influence of obstacle shapes on the hydrogen explosion characteristics and reduce the destructive damage caused by obstacles, large eddy simulation is used to simulate the hydrogen/air explosion process under different obstacle shapes and obstacle blockage rates, with a focus on studying the acceleration differences of different obstacle shapes and their sensitivity to changes in blockage rates. The results indicate that when the blocking rate is low, compared to single-type obstacles, grid-type obstacles have a stronger destructive effect on the regular flow field of the flame front. As the number of gaps in grid-type obstacles increases, their destructive effect on flow field movement will further increase, causing sustained distortion of the flame front and making it difficult to restore to a regular state. After the blockage rate increases, the destructive difference between the shape of obstacles and the regular flow field becomes no longer significant, and the flame front in all types of obstacles in pipelines will undergo continuous distortion. Single-type obstacles will have a better sensitivity to blockage rate than general grid-type obstacles, which will have a better acceleration effect on flame propagation. However, by adjusting the individual void area, grid-type shaped obstacles can transform their mechanism of flame acceleration, which has higher acceleration potential than unilateral obstacles. The increase in blocking rate will amplify the acceleration differences caused by the shape of obstacles. The research content can provide basic reference data for the prevention and control of hydrogen fire accidents, and also has good reference significance in the design of hydrogen power systems.

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更新日期/Last Update: 2023-12-18